-101- 
stabilizing and increasing the inaectioidal action of these smokes 
are described.-- -Goodhue and Sullivan (235, 236) * 
An extract of the fruit of the Amur cork tree was about as 
toxio as derris extract to the housefly •— Haller (260 ). 
In a study on the effeot of sesamin and related compounds on 
the insecticidal aotion of pyrethrum on houseflies, it appears that 
the nature of the substituents on the benzSne ring is the determing 
factor in the synergistic action of this class of compounds, and that 
their spatial configuration is of little or no importance* In the 
case of nicotine, rotenone, deguelin, and toxicarol, the optical ac- 
tivity plays an important role in insecticidal action.— Haller and 
coworkers (251 ) • 
Tests demonstrated that Tephrosia virginiana may be success- 
fully substituted for derris and cube roots in housefly sprays. No 
added solvent was necessary to obtain kerosene extracts of rotenone- 
bearing roots with a high degree of toxicity. The insecticidal im- 
portance of constituents other than rotenone was again emphasized. 
—Jones and Sullivan (327 ) • 
In Russia derris dust at the rate of 0.1 gram per cubic meter 
was as effective in killing houseflies enclosed in a glass chamber 
as pyrethrum powder at the rate of 2 grams per cubic meter. Pyre- 
thrum acted more quickly because it paralyzed the flight muscles, 
but a small proportion of the paralyzed muscles reoovered. With 
derris, death always followed the initial paralysis of the first 
pair of legs.— Mir onov and ooworkers (420 ) . 
Acetone extracts of the roots of bushy, small-leaved Lonchocarpus 
plants in Puerto Rico were more toxic to house flies than those of 
the tall, large-leaved plants.— [Moore] (422) ♦ 
Against housefly eggs 1*5 to 6 hours old, suspensions of derris 
powder, derris extract, or rotenone (all used as dips) were the most 
effective of the materials tested. Derris powder apparently contain- 
ed water-soluble materials toxic to the eggs in addition to the small 
quantities of soluble rotenone. The marc remaining after one water 
extraction was still toxic Water suspensions of derris extractives 
or powder appeared to be fairly stable. Extraots from Tephrosia 
piscatoria and JT. virgin! ena were also toxic .—Richards' on ( 503T ~ 
According to the literature, mixtures of rotenone with oertain 
organic thiocyanates display synergistic action against houseflies. 
— Roark (506). 
